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Ball mills tumble iron or steel balls with the ore The balls are initially 5–10 cm diameter but gradually wear away as grinding of the ore proceeds The feed to ball mills dry basis is typically 75 vol ore and 25 steel The ball mill is operated in closed circuit with a particle size measurement device and size control cyclones

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10 Motion of second s hand in a clock is a circular motion 11 In rotational motion whole body moves about an axis 12 The result of a measurement is expressed in two parts We hope the given NCERT MCQ Questions for Class 6 Science Chapter 10 Motion and Measurement of Distances with Answers Pdf free download will help you If you have any

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Tests on Stones Crushing Strength Test Water

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